Photographic shutter.



PATENTED JAN. 29, 1907 H. A. BYERS. PHOTOGRAPHIG SHUTTER.

APPLICATION FILED AUG.14. 1905.

luuentoz WM W fi z j 1 J G a witnesses HENRY A. BYERS, OF PE ELL,WASHINGTON.

PHOTOGRAPHIC SHUTTER.

I Specification of Letters Patent.

Application filed August 14,1905. Serial No. 274,140.

To all whom it may concern:

Be it known that I, HENRY A. BYERS, a citizen of theUnited States,residing at Pe Ell, in the county of Lewis and State of Washington, haveinvented a new and useful Photographic Shutter, of which the'followingis a specification.

My invention relates to certain new and useful improvements in shuttersfor cameras, and has for its object to provide a shutter that is verysimple and cheap in construction and one that can be easily and quicklyattached to any camera.

Another object of my invention is to'pro vide a shutter that isespecially adapted to take the clouds and scenery and one that can ibeswung out of the way while focusing the ens.

A further object of my invention is to provide a shutter for a camerathat will vary the relative exposure of the plate so that the skyportion and foreground will be exposed to the actinic action of the'raysof light diifer'ent lengths of time, so that an even negativecan beobtained under all conditions.

With these objects in view the invention consists of the novel featuresof construction,

' arrangement, and combination of parts here- -my shutter.

inafter fully described, and pointed out in the claims.

In the drawings forming a part of this specification, Figure 1 is a sideelevation of Fig. 2 is a. vertical section taken on the line 2 2 ofFig. 1. Fig. 3 is a sectional view taken on the line 3 3 of Fig. 1.

Referring to the drawings, A indicates the frame, provided-with anopening A, on the face of which is mounted a metal plate B, having anopening B in alinernent with the opening A of the frame. The lower endand side edges of the plate-are bent back upon the plate, formingguideways/B and a stop B for the sliding shutter C to work up and downin, which shutter is provided with a slot C of a length equal to thediameter of the opening B and through which the light passes. Secured tothe shutter C and extending out to one side is an arm C having anopening C adjacent its end and provided with a thumb-screw G, leadingintosaid opening, for the purpose hereinafter described.

Mounted in a recess in the face of the frame to one side of the plate B,adjacent the lower edge, is secured-anopen-end cylinder D by inder Disprovided with an opening D, in its side and an opening D in its end, theopening D being of greater size than the opening Di, for the purposehereinafter described.

Working in the cylinder D is a piston-head F, carried by the piston-rodF, which extends out the open end of the cylinder and through theopening 0 in the arm C of the shutter and up into the smaller cylinderG, arranged adjacent the upper edge of the frame, and is secured in thearm by the thumb-screw C and is provided with a piston-head F to fitthe'.cylinder G, which is secured on the frame, like the cylinder D, bya band G and nut G The cylinder G is provided with anoutwardly-extending tube H adjacent its end, to which a flexible tube His adapted to be secured, carrying a bulb H at its end. i

To the lower end of the cylinder G is se.

cured a.spring-catch G adapted to engage the arm 0 and hold the shutterup until it has been forced out by the pneumatic pressure from the bulbagainst the piston-head F which will allow the arm C to drop, carryingthe shutter C, and it will be seen that the slot C will travel fasterover the upper po1= tion of the opening in the frame and plate'f'as thepiston will drop faster at first until it passes the large opening D inthe cylinder, as the air will escape faster. It will then drop slowlyuntil the air has escaped out of -the small opening D and it has reachedthe bottom.

To the back of the frame is secured a strip 1, to which is-hinged aplate J, provided with an opening J, in alinement with the openingPatented Jarr. 29, 1907.

of the frame, adapted to fit over the lens-tube of the camera, so thatthe shutter can be moving out of the way when focusing the camera, andis securely locked to the frame by a spring J when desired to be used.

A stop-pin K, provided with an elongated head, is secured to the frame Aabove the plate B and is adapted to engage the shutter C and prevent thesame from belng accidentally pulled out of the guideway.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a deviccof the kind described, the combination with a frame havinga plate hinged thereto, openings formed in the frame and plate, of ashutter working in guideways carried by the frame and means connected tosaid shutter for impartin a rapid initial movement and a slow terminalmovement to the shutter, for the purpose described.

2. In a device of the kin .l described the 5 combination with a frame,-provided with an opening, of a shutter provided with a slot Working oversaid opemng, and means con-' nected to said shutter for imparting arapidinitial movement and a slow terminal move- 1 o ment to the shutterpassing over the openin 1 5 of a shutter working in guideways, aspeedregulator attached to said shutter, and 5 means for operating saidshutter, for the purpose described.

4. In a device of the kind described, the

20 combination with a frame having an opening formed therein, of a platesecured on said frame having an opening in almement with the openmg 1nthe frame and provided with guideways, a shutter Working in said guide-2 5 Ways carrying an arm, a cylinder arranged on said frame, a rodconnected to said arm, a piston-head secured on the end of Sfi ld rodworking in the cylinder, and means connected to the cylinder foroperating the piston, for the purpose described.

5. In a device of the kind described, the combination with a frameprovided with a hinged plate adapted to fit on the lens-tube of acamera, of a shutterworking in guide- Ways on said frame, an arm securedto said shutter, a rod secured to said arm, and means for operating saidrod, for the pur pose described.

6. In a device of the kind described, the combination with a frameprovided with an opening, and a plateadapted to besecured .over thelens-tube of the camera, hinged to the frame, of a shutter provided'with a slot, working in guideways, means connected to said shutter forallowing the slot in the shutter to )ass over the opening, in the frameat a rapid initial movement and a slow terminal movement, a and meansfor operating said shutter, for the purpose described.

.IIENRY A. BYERS.

Witnesses J. G. DUNLOP, HARLEY E. BYERS.

